Hydraulic jacking system for vehicles



Dec. 6, 1938. D. w. SESSIONS 2,139,473

HYDRAULIC JACKING SYSTEM FOR vVEHICLES Filed Nov. 19, 1935 4Sheets-Sheet 1 ,2 lNVENTOR DONALD WILFRED 5555mm BY I 9%.

' ATTORNEMS v Dec. 6, 1938 D. W. SESSIONS 2,139,473

HYDRAULIC J AGKING SYSTEM FOR VEHICLES Filed Nov. 19, 1955 4Sheets-Sheet 2 I DONALD WIFRED SSSIONS %@ZZIA@% 90% ATTORNEYS INVENTOR=Dec. 6, 1938. D. w. SESSIONS I 2,139,473

HYDRAULIC JACKING SYSTEM FOR VEHICLES Filed Nov. 19, 1935 4 Sheets-Sheet5 1 6 4, GK 7 Q INVENTOR= DONALD WILF'RED 5E66IONS WWQrfi ATTORNEYSDec.6,1938. Dw ES oNs 2,139,473

HYDRAULIC JACKING SYSTEM FOR VEHICLES Filed Nov, 19, 1935 "4Sheets-Sheet 4 7&

Jdldlld '1 INVENTOR P DONALD WILF ED SESSIONS [ATTORNEY Patented Dec. 6,1938 UNITED STATES PATENT OFFICE HYDRAULIC JACKING SYSTEM FOR VE- HICLESDonald Wilfred Sessions, Willesden, London,

' England Application November 19, 1935, Serial No. 50,531 In 'GreatBritain October 16, 1935 3 Claims. (01. 60-52) This invention relates tohydraulic jacking sys- Figure 8 is a sectional view of the part of thetems: for vehicles of the kind in which a pump pump control deviceswhich are situated adjadelivers high pressure -fluid which is utilizedfor cent to the dashboard:

operating lifting jacks permanently attached to Figure 9 is a sectionalview on the line 9-9 of the vehicle. Figure 8; 5

According to an important feature of the in- Figure 10 is a sectionalView similar to Figure vention an annular piston type of pump of the 8,but showing a modified arrangement; kind described in the specificationof Patent No. Figure 11 is a sectional view similar to Figure 41,997,233 can be coupled to the engine or other but illustrating amodified arrangement adapted in driving part directly or by means of aclutch acfor use with the arrangement of Figure 10; I0 tuated bya key orother control member adapted Figure 12 is a View similar to Figure 10but to be actuated by the driver. showing a further modification;

According to a further important feature of Figure 13 illustrates a pumphaving the control the invention the pump, which is preferably aldevicemounted on it adjacent thereto; 1.3 though not essentially of theannular piston type, Figures 14 and 15 are side and end elevational 1 5is associated with such a clutch and also with a views respectively ofthe pump attached to an release valve which controls release of pressureelectric motor for driving the pump.

fluid from the jack cylinders to exhaust or oil The pump A is mounted onthe vehicle in a reservoirs, and the clutch and release valves aresuitable position according to the part from which if connected to acommon control member whereby it is to be driven. In Figure l the pump Ais operation of the control member brings about shown attached to adynamo B to which it can the desired operation, both of the clutch andof be coupled, and in Figures 14 and 15 it is shown the valve. attachedto an electric motor B operated from The pump may be designed forattachment to the vehicle batteries B The driving and stopthe back of adynamo or dynamo drive and may ping of the pump is effected through acontrol :be designed to form a continuation of the dynamo on thedashboard indicated generally at D which casing. Alternatively, the pumpmay be coupled is connected by a low pressure device D such as to theusual drive of the fan, water pump, igniapipe or cable (but preferablynot a high pressure tion distributor, engine oil pump, revolutioncounfluid line) to the pump, or by a control D (Figter or to the camshaft, crank shaft, or other ure 13) mounted on the pump adjacentthereto. 30 suitable part, or to a specially provided electric The pumpdraws oil from a reservoir E through a motor driven for example from thevehicle batpip El and r s t oil through a discharge teries and may becoupled directly or by means pipe E into a horizontal pipe line E andflexible of a belt, chain, shaft, flexible shaft, or other tubes E E toa pair of hydraulically operated drive. jacks E permanently attached tothe rear axle In order that the invention may be clearly um and to apair of hydraulically operated jacks E derstood and readily carried intoeffect the same permanently attached to the flont axle- The will now bedescribed more fully with reference lifting jac and means attaching themhe to the accompanying drawings in which:-- manently to the vehicle maybe as disclosed in the to Figure l is a diagrammatic illustration of aspecification of my Patent Number 2,065,030. motor car having appliedthereto a. jacking sys- The pump comprises a main casting or body A temin accordance with the invention; and a cap A held on to the body bybolts A some Figure 2 is a sectional View of the pump on the of whichbolts also serve for attaching the pump lines 2--2 of Figure 3; to thedynamo, electric motor, or other appro- 43 Figure 3 is a sectional Viewof the pump on the priate part. Mounted about centrally in the 45 line fFigure pump body A is a pump spindle A carrying a Figure 4 is asectional view on the line 4--4 of rotor A in which three radial slots aare formed. Figure 5 of part of the pump. control devices; The cap A hasan annular recess therein located Figure 5 is an end elevational view ofthe pump ecce'ntrically with respect to the axis of the spinto with theclutch devices removed from the upper dle A The annular pistons comprisethree pisha ton blocks a located in said recess and carrying Figure 6 isa sectional view of the pump on the rollers a that are engaged in theradial slots a line Of Figure When the spindle A is rotated the pistonblocks Figure 7 is a sectional view of the pump on the a rotate and moveapart and together alternateline '--'1 of Figure ly and draw oil intothe spaces between them 55 from the inlet port A and expel this oil tothe outlet port A in the pump body A The inlet port A communicatesthrough an inlet passage a. with the pipe E and the outlet port Acommunicates through a delivery passage a with the pipe E In the pumpbody are two conduits F, H, parallel with each other and perpendicularto the passage a a and establishing communication between said latterpassages. The outlet passage a contains a non-return ball valve a Thepassage F is a safety passage controlled by a safety valve normally heldon its seating by a spring I the pressure of which is adjustable byadjusting the screw F. The passage H is a release passage controlled bya valve member h for releasing the fluid pressure supplied to the jacks.The release valve member is situated transversely across the inletpassage (1 and only requires an air lock ring comprising a rubber ringit in an annular grove instead of a pressure gland. Oil leaking alongthe spindle A is drawn off through apertures a into the inlet passage aThe passages a a are on the same side of the rotor A this being possibleby reason of apertures A through the rotor through which oil passes fromthe port A to the piston blocks and thence back through these aperturesto the port A The clutch for coupling to the dynamo drive, electricmotor armature or other driving part is mounted on the pump spindle AThe spindle A has mounted on its end two ball races J on which a,rotatable clutch collar K is mounted. This collar is slotted at K orotherwise suitably formed to be connected permanently to the drivingmember and has clutch teeth is. The ball races J and the collar K arenormally held on the spindle by the head of a screw J which is screwedinto the end of the spindle A Splined on to the spindle between thecollar K and the pump body is a slidable annulus K having clutch teeth kand movable axially of the spindle to bring its teeth into and out ofengagement with the teeth on the collar K. Each of the teeth ispreferably in the form of a truncated cone. The annulus is mounted inball bearings K in the yoke K of a clutch operating gear, which yoke ismounted on trunnion pins k in the pump body A The yoke has an integralarm K (Figures 4 and 5) which extends into the interior of a tube K'through a slot in the wall of the tube. The extremity of this arm isengaged on opposite sides by two steel balls K K the steel ball K beingloaded by a spring K which is adjustable for compression by a grub screwK in the tube. The tube is slidable in the pump body A and is connectedto the interior movable part of the push-and-pull cable D Operation ofthis cable actuates the arm K and the yoke K to engage or disengage theclutch. If at any time the clutch is overloaded the spring loaded ball Kwill yield to enable the clutch to move out of engagement. Operation ofthe release valve is efiected by the same actuation of the cable D Forthis purpose the release valve member h is connected to the tube K by alink it held in position by a nut ii The spring loaded ball K is on thesame side of the arm K as the valve member and the push-pull cable is onthe opposite side.

For actuating the cable D it is connected to the device D mounted on thedashboard of the vehicle. The driver fits a detachable key M in a socketM mounted on the dashboard and rotates the socket. This socket isrotatably mounted by a ball bearing in an outer barrel M which isconnected at its rear end to the outer tube of the cable D The socket isinternally screw-threaded to receive a thread member M which can moveaxially but is held against rotation by a square head M This movablemember is connected to the inner movable part of the pushand-pull cableD For giving a warning to the driver an electric lamp R is arranged onthe dashboard of the vehicle or in some other position readilyobservable by the driver and means are provided for s'upplying electriccurrent to the lamp including an electric circuit R and a device wherebythe circuit is broken when the jacking system is out of use and madewhen the system is in use so that the lamp will then be on to giveadequate warning tothe driver. The said circuit also is arranged to bebroken and made by actuation of the usual engine switch R so that thelamp will not be left on inadvertently after the engine switch has beenturned oif. The device referred to comprises a two-armed lever Rpivotally mounted in a small housing R on the barrel M and one arm ofthis lever extends through a slot or slots into the path of the squarehead M The other arm forms or carries an electric contact member adaptedto make contact with another contact member R carried by the housing R.A spring R is provided between the first arm. and the said housing whichtends to move the lever to bring the two contacts together. Foroperating the lifting jacks the engine switch will be on and the keywill be rotated in the appropriate direction to move the movable memberby reason 01' the screw-threaded engagement in the direction to couplethe pump through the clutch to the driving member. This movement of themovable member releases the two-armed lever R and the twocontacts cometogether and the electric circuit through the lamp is thus completed.The electric circuit will be broken either by turning the engine switchoiT or by rotating the key M sufficiently in the opposite direction touncouple the pump from the said driving member. If for instance thejacks are left extended and the vehicle is left overnight, the engineswitch will be off and the lamp will therefore not be using the vehiclebatteries, but when the engine switch is turned on the lamp circuit willbe completed and will warn the driver that the jacks are extended. Theswitch R also controls the usual ignition indicator lamp R Instead ofemploying a push-and-pull cable D this device may be in the form of atube containing a column of fluid as shown in Figures 10, 11, and 12.The tube D contains a column of liquid and the movable member M is inthe form of a piston having a rubber washer m attached to it. The otherend of the tube D is connected to the pump body A as shown in Figure 11and the column of liquid acts upon a piston S which is provided with arubber washer S The piston S is fixed to a cross-bar S which actuatesthe tube K and valve member h as described with reference to Figure 4.Allowance should of course be made in the spacing of the clutch membersor otherwise for expansion of the column of fluid. In the modificationshown in Figure 12 the key M has a screw-threaded engagement with thebarrel M so that rotation of the key causes the key to move along thebarrel and push the piston M along the cylinder comprising part of thebarrel. The piston M carries a small projection or terminal M whichpasses through a slot in the barrel and moves into and out of engagementwith a screw R on the housing R this screw being connected in thecircuit of the lamp R. Return springs S and S operate respectively onthe parts h and K to return these parts and the column of liquid to thenormal positions. A valve controlled nozzle S facilitates initialintroduction of the column of liquid.

In the modification shown in Figure 13 the dashboard control isomittedand the part h of Figure 4 or S of Figure 11 is operated by a screw Tmounted on the pump body. The part h or S controls a switch B instead ofa clutch.

In the arrangement shown in Figures '14 and 15 the electric motor B hasits terminals 22 supplied with current from the battery B and the pump Afits the motor and is attached thereto, the pump body having asubstantially continuous appearance with respect to the motor casing.With this arrangement the clutch K K etc., is omitted and a switchsubstituted therefor in the motor circuit, this switch being controlledby the movement of the tube K It will be observed that the jackingsystem is so constructed and arranged that in any on position of thecontrol means the jacks will be operated simultaneously to raise all ofthe wheels of the vehicle off the ground. By this arrangement thedisadvantage heretofore experienced of a driver setting the vehicle inmotion whilst the front jacks are extended is obviated. The furtherdisadvantage of jacking with only one or two jacks on a steep inclinethus putting considerable bending strain on the jacks is also obviated.Also the invention avoids bringing a pressure fluid pipe line up to thedashboard.

What I claim and desire to secure by Letters Patent of the United Statesis 1. A jacking system for permanent attachment to a vehicle comprisinga pump having a pump body and pump means including a pump spindle in thepump body, a source of fluid supply connected to the intake side of saidpump, hydraulically operated lifting jacks, pipe communications betweenthe jacks and the delivery side of the pump, a release valve mountedwithin the pump body and adapted to release the fluid pressure suppliedto the jacks, an electric motor for driving the pump and fixed to thepump co axially with said spindle so that the pump body has asubstantially continuous appearance with respect to the motor casing, amake and break device in the motor circuit and carried by the pump body,

a movable member mounted in the pump body and connected to the releasevalve and to the make and break device, and a device for transferringmanual force exerted by the driver to the said movable member so assimultaneously to close the valve and the make and break: device,whereby the pumping means is driven and fluid pressure supplied to atleast one of the jacks.

2. A jacking system for permanent attachment to a motor vehiclecomprising a pump having a pump body and pump means in the pump body, asource of fluid supply connected to the intake side of said pump,hydraulically operated lifting jacks, pipe communications between thejacks and the delivery side of the pump, a release valve mounted withinthe pump body and adapted for releasing the fluid pressure supplied tothe jacks, a clutch mounted adjacent to the pump body, an electric motorfor driving the pump, a make and break device in the motor circuit andcarried by the pump body, a movable member mounted in the pump body andconnected to the release valve and to one of the clutch elements, adevice leading from the movable memher to a position adjacent to thedriver and 0p erable to transmit movement applied by the driver to themovable member so as to close the valve and the make and break device todrive the pumping means and supply fluid pressure to at least one of thejacks, and means within the pump body whereby the supply of fluid to thejacks ceases when a predetermined pressure is reached.

3. A jacking system for permanent attachment to a motor vehiclecomprising a pump having a pump body and having pump means and a pumpspindle in the pump body, a source of fluid supply connected to theintake side of said pump. hydraulically operated lifting jacks, pipecommunications between the jacks and the delivery side'of the pump, arelease valve mounted within the pump body and adapted for releasing thefluid pressure supplied to the jacks, an electric motor for driving thepump, a circuit for said motor, said circuit including a make and breakdevice operable under control of the operator to close both the valveand the make and break device, whereby the pumping means is driven andfluid pressure supplied to at least one of the jacks, and means withinthe pump body whereby the supply of fluid to the jacks ceases when apredetermined pressure is reached.

DONALD WILFRED SESSIONS.

